scholarly journals FENDER SELECTION CRITERIA

1988 ◽  
Vol 1 (21) ◽  
pp. 220
Author(s):  
F. Vasco Costa
Keyword(s):  
Selection Criteria ◽  
Natural Period ◽  
Loading And Unloading ◽  
Period Of Oscillation

Fenders are to be selected taking into account two quite distinct functions they have to fulfill: - During berthing manoeuvres fenders have to avoid damage to the ship and to the berthing structure; - After ships are already berthed and moored, fenders have to keep them quiet during loading and unloading operations. To fulfill the first function fenders have to be able, while deflecing, to absorb a very large amount of energy. To fulfill the second function fenders need to be able, while recovering their form, to dissipate a large amount of energy. Besides, they have to contribute to reduce or to increase the natural period of oscillation of already moored ships, depending on their tendency to oscillate in phase or out of phase with waves reaching the berths.

scholarly journals On the Relationship between the Pure Delay and the Natural Period of Oscillation

2016 ◽  
Vol 07 (06) ◽  
pp. 504-507
Author(s):  
Daniel Chuk ◽  
Gustavo Rodriguez Medina
Keyword(s):  
Natural Period ◽  
Pure Delay ◽  
The Relationship ◽  
Period Of Oscillation

Cellular atmospheric waves in the ionosphere and troposphere

1950 ◽  
Vol 201 (1065) ◽  
pp. 216-234 ◽  
Keyword(s):  
Magnetic Field ◽  
Vertical Component ◽  
Temperature Gradients ◽  
Vertical Shear ◽  
Small Element ◽  
Natural Period ◽  
Specific Heats ◽  
A Value ◽  
Electron Clouds ◽  
Period Of Oscillation

Consideration of horizontally travelling disturbances of electron densities in the F 2 region of the ionosphere suggests that they are identical with the supposed vertically travelling disturbances discovered by Wells, Watts & George (1946). They appear to be due to horizontally travelling atmospheric cellular waves of the type first investigated by Lamb. The theory of such waves is developed to include wind with linear vertical shear, special attention being paid to the conditions of bounding by temperature gradients. It is found that such waves appear to be the cause of the microbarometric oscillations long known in the troposphere. The theory of these is worked out in some detail, and an explanation found for Johnson’s discovery that these oscillations have periods agreeing closely with B runt’s natural period of oscillation of a small element of atmosphere. In the ionosphere, the earth’s magnetic field profoundly affects the observed motions of ionization in the F 2 region, leading to a height gradient in the phase of these oscillatory motions. This gradient makes horizontally travelling disturbances appear to have a vertical component of motion, thus simulating vertically moving electron clouds. The bounding conditions for these cells in the F 2 region appear to necessitate a value for γ, the ratio of specific heats of air, considerably less than 1.4.

scholarly journals Bioelectric Oscillations of Bean Roots: Further Evidence For a Feedback Oscillator I. Extracellular Response to Oscillations in Osmotic Pressure and Auxin

1961 ◽  
Vol 14 (2) ◽  
pp. 231 ◽  
Author(s):  
IS Jenkinson ◽  
BIH Scott
Keyword(s):  
Theoretical Model ◽  
Osmotic Pressure ◽  
Feedback Loop ◽  
Physiological Model ◽  
Natural Period ◽  
Bathing Medium ◽  
Auxin Concentration ◽  
Weakly Conducting ◽  
Period Of Oscillation ◽  
Bioelectric Fields

Bean roots subjected to oscillations in osmotic pressure or in the auxin concentration of their weakly conducting bathing medium exhibit corresponding oscillations in their bioelectric fields with a resonance at the natural period of oscillation (approx. 5 min). The amplitude and phase responses, expressed as a function of the periods of the applied oscillations, are in agreement with those predicted from a theoretical model of a feedback loop. A physiological model compatible with the theoretical one is suggested.

Current Trends in the Training and Utilization of Paraprofessionals in Speech and Language Programs

1991 ◽  
Vol 22 (2) ◽  
pp. 51-59 ◽  
Author(s):  
Kathy L. Coufal ◽  
Allen L. Steckelberg ◽  
Stanley F. Vasa
Keyword(s):  
Selection Criteria ◽  
Job Descriptions ◽  
Paraprofessional Training ◽  
Language Programs ◽  
Program Administrators ◽  
Current Trends ◽  
Training And Supervision ◽  
Communicative Disorders ◽  
Supervision Practices ◽  
A Current

Administrators of programs for children with communicative disorders in 11 midwestern states were surveyed to assess trends in the training and utilization of paraprofessionals. Topics included: (a) current trends in employment, (b) paraprofessional training, (c) use of ASHA and state guidelines, and (d) district policies for supervision. Selection criteria, use of job descriptions, training programs, and supervision practices and policies were examined. Results indicate that paraprofessionals are used but that standards for training and supervision are not consistently applied across all programs. Program administrators report minimal training for supervising professionals.

Selection criteria for the biographies of female role models

1978 ◽  
Author(s):  
Agnes N. O'Connell ◽  
◽  
Nancy Felipe Russo
Keyword(s):  
Role Models ◽  
Selection Criteria ◽  
Female Role
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